Make dumpRSAPublicKey also accept a public key in PEM format

utility/dev_make_keypair

Index: utility/dev_make_keypair
diff --git a/utility/dev_make_keypair b/utility/dev_make_keypair
index b055826072e2375ff64dd53acde26ebea4714f9a..d1d34ad4ae8e08debe0517ad65ee7b07f2b47c4c 100755
--- a/utility/dev_make_keypair
+++ b/utility/dev_make_keypair
@@ -53,7 +53,7 @@ function make_pair {
   openssl req -batch -new -x509 -key "${base}_${len}.pem" \
     -out "${base}_${len}.crt"
   # generate pre-processed RSA public key
-  dumpRSAPublicKey "${base}_${len}.crt" > "${base}_${len}.keyb"
+  dumpRSAPublicKey -cert "${base}_${len}.crt" > "${base}_${len}.keyb"
 
   # wrap the public key
   vbutil_key \